JPS5926519A - Polyester spun yarnlike yarn - Google Patents

Abstract

PURPOSE:The titled spun yarnlike yarns, having thick and thin parts in the long direction thereof, and obtained from specific highly oriented undrawn polyester yarns as feed yarns, and having special conditions of single filaments constituting the yarns and further large unevenness in fineness and difference in dyeing. CONSTITUTION:Polyester spun yarnlike yarns, obtained from highly oriented undrawn polyester yarns, prepared by spinning at a high speed, and having >=20X10<-3> birefringence (DELTAn) as feed yarns, and having irregular thick and thin parts in the long direction thereof, >=1.3 thick and thin ratio (ratio between the diameters of the thick and thin parts of single filaments constituting the yarns, >=5% (C%) of the yarns and the birefringence (DELTAn) of the thick parts in the single filaments below that (DELTAn) of the feed yarns, and large unevenness in fineness and difference in dyeing without embrittling in the post processing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyester filament yarn having irregularly thick and thin fibers in the longitudinal direction, and more specifically, the present invention relates to a polyester filament yarn having irregularly thick and thin fibers in the longitudinal direction, which is obtained by using a highly oriented polyester undrawn yarn as a feeding system. The present invention relates to a polyester yarn having a polyester yarn.

In recent years, fabrics made from polyester μ yarn have become extremely important for clothing, especially for inner and outer wear, due to their excellent features such as wash-and-wear properties, wrinkle resistance, moderate firmness, and waist. There is. However, consumer demands for clothing are becoming increasingly diverse, and various differentiated materials such as large silk threads are being proposed in response to the trend toward fashion in the market.

Conventionally, large and fine polyester yarns have been produced by various methods.1 For example, when the supply system is undrawn yarn with a birefringence (Δn) varying from 0.5 to 10 and 0-3, most of the methods are Although it has the advantage of having a large diameter ratio (thickness to fineness ratio) and dyeing difference between details, the darkness of most parts is too low, so it becomes brittle and easily breaks due to heat treatment during post-processing such as false twisting and dyeing. It has the disadvantage of becoming. In addition, large fine yarns using highly oriented undrawn yarns with a birefringence index (Δn) of about 15 to 80 x 10-'' as a feeding system are known to solve the above-mentioned drawbacks, but it is not possible to simply mechanically Since it is a large fine yarn obtained by drawing conditions such as stretching with varying drawing ratios, the majority of the yarn is also slightly stretched, exceeding the directionality of the supply system, and the orientation between the major part and the small part is different. Since the difference in degree is small, there is a drawback that the difference in thickness and dyeing number is small.

The present invention solves the above-mentioned drawbacks of the conventional large and fine polyester yarn, and its purpose is to create a polyester spun-like yarn that does not become brittle during post-processing, has wrinkles, uneven fineness, and large differences in dyeing. is to provide.

The purpose of the present invention is to obtain birefringence (Δn) obtained by high-speed spinning.
A yarn having thick/thinness in the longitudinal direction obtained by using a highly oriented undrawn polyester yarn having a weight of 20 x 1 g-' or more as a supply system, and the ratio of thick/thinness of single filaments constituting the yarn is 1.
．． 6 or more, the CLM of the yarn is 5g6 or more, and the birefringence of the majority of the single filament is greater than the birefringence of the supply system (
This can be achieved by using a polyester spun-like yarn that is characterized in that it is less than or equal to Δn).

The present invention will be explained in more detail below.

First, the polyester spunlike yarn of the present invention has a thick and thin structure in the longitudinal direction, which is obtained by using a highly oriented polyester undrawn yarn with a birefringence 4 (Δn) of 20 x 10-' or more obtained by high-speed spinning as a feeding system. It's a thread.

The thick-to-fine ratio of the single filaments constituting the yarn is 1.3 or more,
C%, which indicates unevenness in yarn fineness, is 5% or more.

In order to give the yarn a spun-like fineness unevenness, the thickness ratio of the single filaments constituting the yarn should be 1. It is important that the CLI6 of the yarn is above 5% 1;L for ♂1, and if the thick-to-fine ratio is less than 1.3 and the C% is less than 545, there will be less fineness unevenness, that is, unevenness unevenness. Poor.

It is not possible to impart a spun-like appearance to the yarn.

In addition, the polyester spunlike yarn of the present invention needs to be obtained using a high 1Σ direction undrawn polyester yarn having a birefringence (Δn) of 20×10'' or more as a supply system.

When an undrawn yarn with a diameter of 20 x 10-3 or more is used as a supply system, most of the polyester spunlike yarn obtained has a birefringence (Δn) or less of the supply system, as described below. Since the yarn can also have high orientation, it is possible to prevent the disadvantage that most of the yarn becomes brittle during post-processing such as false twisting and dyeing, making it easy to break the yarn. When an undrawn yarn with a birefringence index (Δn) of less than 20 x 10-' is used as a supply system, the birefringence index (Δn) of the thick part, which is smaller than the birefringence index (Δn) of the supply system, is too low. On the other hand, if the birefringence (Δn) of the supply system is too large, even if the birefringence (Δn) of the majority of the supply system is smaller than that of the supply system, it will cause thick parts to become brittle during post-processing. Since the difference in birefringence between the two is small and the difference in dyeing is poor, it is preferable to use a high potency polyester yarn having a birefringence (Δn) of 30 to eo x 10-' as the supply system.

As mentioned above, the thick-to-fine ratio of the single filaments constituting the yarn is 1.3 or more, and the C% is 5% or more.

It is possible to impart spun-like fineness unevenness to the yarn and at the same time impart a certain degree of dyeing difference, but as it is, the difference in shading after dyeing is poor, and in order to increase the difference in shading after dyeing, it is necessary to It is extremely important that the birefringence index (Δn) of the supply system is equal to or lower than that of the supply system. In this way, the birefringence (Δn) is 20'X 1'0-
Even though the above highly oriented undrawn polyester yarn is used as the supply system, the birefringence (Δn) of most of the single filaments is equal to but smaller than the supply system, so the following formula (0) is obtained.

Δn3-Δnt≧Δn3-Δn,)Δn3-^n4
・・・－・・・・・・(1) However, in the formula (1), Δn1: Birefringence of the supply system Δn: Birefringence of the majority of the single filament ΔnSusu: Birefringence of the details of the filament, 100~ 200 x 10-
” Δn4: The birefringence of most of the single filament of the conventional yarn obtained from the yarn with birefringence (Δn, ) under the drawing conditions, and since it has been drawn to some extent, Δn4>Δnl Therefore, from equation (1), As is clear, the birefringence difference (height, −Δn
, ) are obtained from the same supply system and the birefringence difference between the fI part and the main part (tsn* - elevation a
), and in general, the smaller the birefringence (Δn), the better the dyeability. can do. In this case, the smaller the birefringence index (Δn,) of most of the single filament is than the birefringence index (anl) of the supply system, the larger the difference in dyeing of the yarn can be.
If it becomes too small, most of it will become brittle during post-processing such as false twisting and dyeing.

On the other hand, if Δnff1 is large, even if Δnt is smaller than Δn1, the birefringence difference (Δn3-8n++) between the detail and the major part will be small and the difference in dyeing will be small, so the major part will become brittle during post-processing. In order to increase the dyeing difference without causing problems, the birefringence (Δn,) of the majority of the single filament is preferably about 15 to 70×10 −3 .

As mentioned above, the polyester spunlike yarn of the present invention is made by using a highly oriented polyester yarn with a birefringence index (Δn) of 20×10-3 or more obtained by high-speed spinning as a feeding system and having a thick and thin shape in the longitudinal direction. Because the yarn has a high degree of amphoteric properties even in most parts, it does not become brittle during post-processing such as false twisting or dyeing, and the thin-to-thickness ratio of the single filaments that make up the yarn is 1. Since the C% is 6 or more and the C% is 5% or more, it is possible to give the yarn a spun-like fineness unevenness, that is, an uneven floor. Furthermore, the birefringence of most of the single filament (Δ
Since n) is less than the birefringence index (Δn) of the supply system, it has the advantage that the difference in shade after dyeing can be significantly larger than that of conventional thick and thin yarns obtained from the supply system with the same birefringence index (Δn). be.

In Mokuhakumei, the polyester that constitutes polyester spunlike yarn is a polymer that has ester bonds in its molecular chain, and is typically represented by polyethylene terephthalate.
Homopolymers, copolymers or blend polymers thereof, and the like are included.

Note that the diameter ratio of a single filament constituting a yarn as used in the present invention is the ratio of the diameter of a large part to a small part of a single filament, and the diameter is measured from a cross-sectional photograph of a large part and is measured in order from the largest one. The average value of up to 3 stones is taken as the diameter of the main part of the single filament, and the IJ diameter is similarly measured from the detailed cross-sectional photograph, and the average value of up to 5 stones in order from the smallest is calculated as the diameter of the single filament detail. It is. Also, the birefringence index (Δn
) is a value measured by the interference fringe needle 01 standard method using a polarizing microscope compensator. The C% is 11^, which was measured under tension using a star manufactured by Zue I Rebeger under the conditions shown in F.

C% Measurement Conditions Next, an example of the method for manufacturing the polyester spunlike yarn of the present invention will be explained.

First, a polyester polymer is spun at high speed to have a birefringence (Δn) of 20 x 10-' or more and a crystallinity of 20%.
Highly oriented and low crystallinity eyes? After obtaining the reester undrawn yarn, the undrawn yarn! Heat treatment is performed at a relaxation rate of IO% or higher without contacting with heating at 4 A, and the birefringence index (Δn) is lowered without significantly increasing the degree of crystallinity.

Next, the yarn of the present invention is obtained by skewering the undrawn yarn whose birefringence index (Δn) has been reduced between a pair of nip loaves at a low temperature and at a low magnification.

Hereinafter, Kisadaaki will be specifically explained using examples.

Examples 1 and 2 Birefringence (Δn) obtained by high-speed spinning 55 x 10"
”.

110d/36 with crystallinity 9.5% and residual elongation 115%
f (Example 1) and (Δn) 45 X 10-',
Crystallinity 9.3%.

An undrawn polyester yarn of 250d/48f (Example 2) with a residual elongation of 118% was subjected to relaxation heat treatment using a non-contact heater with a heater length of 600 mm, and then stretched between a pair of rollers to form a book. The thread of invention was obtained.

Table 1 The obtained yarn has irregularly thick and thin sections in the longitudinal direction.

It had the values shown in Table 2.

Table 2 When a plain weave was woven using the yarns obtained in Examples 1 and 2 and dyed and finished, the majority of the yarns did not become brittle and had sufficient strength for practical use. The good contrast of light and shade and the irregularities of the surface gave it a sumo-like appearance and an exciting appearance.

Comparative Example 1 The same undrawn polyester yarn as in Example 1 was stretched using a hot bin type stretching machine comprising a feeding lobe, a hot pin, and a stretching loaf at a hot pin temperature of 65° C. and a stretching ratio of 1.5.

The obtained drawn yarn was thick and thin in the longitudinal direction, but the birefringence (Δn) of most of the yarn was 59 × 10-', which was larger than the Δn of the spun yarn, and it was Compared to the yarn of Example 1, the 11A lightness difference was poor.

Patent applicant: Unitika Co., Ltd.

Claims (1)

[Claims] (1) Birefringence (Δn) obtained by high-speed spinning is 20X
10-' or more highly oriented polyester undrawn yarn as a supply system, the yarn has a thick/thin ratio in the longitudinal direction, and the thick/fine ratio of the single filaments constituting the yarn is 1.3 or more; 0% is 5% or more, and the birefringence (Δn) of most of the single filaments is less than or equal to the birefringence (Δn) of the supply system.